Merge branch 'update_config'

code refactoring in grader module

change default mode to: qa

change default mode to: qa

fix: missed sys prompt settings for grader

Merge branch 'update_config'

code clean

Merge branch 'update_config'

fix: the order issue in result items of thread pool executor in grader chain

fix: dependency conflicts in requiriements.txt

Merge branch 'update_config'

change README: replace Grader with ReRanker

replace reranker with grader to reduce the haulusilation led by the wrong recall context docs

replace reranker with grader to reduce the haulusilation led by the wrong recall context docs

replace reranker with grader to reduce the haulusilation led by the wrong recall context docs